{"product_id":"siemens-q345-45a-240v-3-pole-plug-in-circuit-breaker","title":"Siemens Q345 - 45 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens Q345 — a 45A, 240V, 3-pole plug-in molded case circuit breaker built to protect your branch circuits with reliability and speed. Designed for quick installation and straightforward replacements, it fits seamlessly into panelboards and load centers.\u003c\/p\u003e \u003ch2\u003eWhat it is and where it fits\u003c\/h2\u003e \u003cp\u003eThe Q345 is a thermal-magnetic molded case circuit breaker that provides overcurrent and short-circuit protection for residential, commercial, and light industrial applications. Its plug-in design simplifies panel maintenance and upgrades, letting you swap breakers without invasive wiring work.\u003c\/p\u003e \u003ch2\u003eKey features\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cb\u003ePlug-in connection\u003c\/b\u003e for fast installation and replacement—minimizing panel downtime.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eThermal-magnetic trip unit\u003c\/b\u003e delivers stable, repeatable protection against both overloads and short circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003e3-pole, 45A, 240V\u003c\/b\u003e configuration suitable for 3-phase circuits common in light commercial settings.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eCompatible with matching OEM load centers and panelboards\u003c\/b\u003e to ensure proper fit and trip coordination.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eVersatile applications\u003c\/b\u003e for residential, commercial, and light industrial electrical systems.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical specifications\u003c\/h2\u003e \u003cul\u003e \u003cli\u003e\n\u003cb\u003eManufacturer:\u003c\/b\u003e Siemens\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003ePart Number:\u003c\/b\u003e Q345\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eType:\u003c\/b\u003e Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eAmperage Rating:\u003c\/b\u003e 45A\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eVoltage Rating:\u003c\/b\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eNumber of Poles:\u003c\/b\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eMounting Style:\u003c\/b\u003e Plug-in\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eApplication:\u003c\/b\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePractical use cases\u003c\/h2\u003e \u003cul\u003e \u003cli\u003eUpgrade or add 3-phase branch circuits in light commercial panels and small industrial control rooms.\u003c\/li\u003e \u003cli\u003eReplace aging breakers in a residential load center when upgrading a subpanel or expanding service to support new equipment.\u003c\/li\u003e \u003cli\u003eProvide dependable protection for motors, HVAC controllers, and other 3-phase equipment in compact installations.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this matters\u003c\/h2\u003e \u003cp\u003eThe Siemens Q345 45A, 240V 3-pole plug-in breaker combines a fast, tool-free installation with a robust thermal-magnetic trip that protects your wiring and devices without nuisance trips. Its OEM-load-center compatibility means you won’t fight fit or coordination when integrating with existing systems. If you’re an electrician, facility manager, or a do-it-yourselfer tackling a panel upgrade, this breaker is engineered to deliver reliable protection with predictable performance when it counts.\u003c\/p\u003e \u003ch2\u003eInstallation notes\u003c\/h2\u003e \u003cp\u003eInstallers should follow local electrical codes and use a licensed electrician for safety. Ensure the replacement breaker matches the panel’s rating and trip characteristics for proper coordination and label the panel accordingly.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355157909666,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens_breaker_and_panel_2fb12edc-7a6f-4ffc-bf2e-c7c52719c82f.png?v=1764689766","url":"https:\/\/www.ampstate.com\/products\/siemens-q345-45a-240v-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}